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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9379130ceb841b5c5178a95ae3598c16e708e4912bc051dad648b57a14c31a' 
  AND token = 'phMu+xXlPUKv7krGhhOpcdI9NqzCl4nOZBiOnqE/XqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}